Watch List notes:

Probus, 276-282. Antoninianus (Billon, 22 mm, 3.36 g, 7 h), Ticinum 3rd officina, 277. VIRTVS PROBI INVICTI AVG Radiate, helmeted and cuirassed bust left, holding round shield and spear over shoulder. Rev. VIRTVS AVG / PXXT Emperor on horseback right, spearing falling enemy below his horse. Cohen -. RIC - (cf. 448). Same dies as Gadoury 6 December 2014, 258, misattributed as RIC 437. Very rare variation, possibly the second known, with an unusual arrangement of the mintmark. Some cleaning marks, otherwise, very fine.